1. GENERAL INFORMATION
1-17
G. Loss power
Check and adjustment Fault condition Probable causes
Raise wheels off ground and
spin by hand
y Brake dragging
y Drive chain too tight
y Damaged wheel bearing
y Wheel bearing needs lubrication
Spin freely
Abnormal
y Punctured tire
y Faulty tire valve
y Fuel / air mixture ratio too rich or lean
y Clogged in air cleaner
y Clogged in muffler
y Restricted fuel flow
y Clogged fuel tank cap breather hole
y Faulty pulse generator
y Faulty CDI unit
y Leaking head gasket
y Worn cylinder and piston rings
y Clean
y Clean the spark plug
y Spark plug is incorrect heat range
y Excessive carbon deposited in
combustion chamber
y Wrong type of fuel
y Fuel / air mixture ratio is lean
y Use of poor quality fuel
y worn piston and cylinder
y Fuel / air mixture ratio is lean
y Wrong type of fuel
y Ignition timing too advanced
y Excessive carbon deposited in
combustion chamber
Check tire pressure
Normal Abnormal
Accelerate lightly, engine speed
can be increase
Normal Abnormal
Check ignition timing
Normal Abnormal
Test cylinder compression
Normal Abnormal
Check carburetor
Normal Clogged
Check spark plug
Normal Fouled or discolored
Check for engine overheating
Normal Overheating
Accelerate or run at high speed
Normal Knocks
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